Identify the sampling designs that use voluntary response sampling. Check all that apply. An online poll is created for sports fans to vote on the winner for the Super Bowl.
A pharmaceutical company advertises for subjects to participate in an online survey about insulin pumps for diabetics.
Each employee is given a mandatory survey to complete about health benefits.
A census taker randomly calls homes to gather data about household income and family demographics.
After each customer service call, callers are asked to stay on the line to complete a brief satisfaction survey.
A used car dealer surveys potential customers about the type of car they are interested in so he can plan his future inventory.